CH627156

Procedure for obtaining 3,3'' - triarylmethanedicarboxylic acid derivatives, of general formula: ** (Formula) ** in which R is hydrogen, a C1-C6 alkyl radical or a halogen atom, and B is a 4-pyridyl radical, or a phenyl radical that may optionally contain 1 to 3 substituents chosen from the group consisting of halogen atoms, and nitro, cyano, carbamoyl, carboxy or formyl radicals, or a pharmaceutically acceptable salt thereof, but with exclusion of those compounds of formula I in which R is a methyl radical and B is a phenyl, 2-chlorophenyl, 4-chlorophenyl, 2,6-dichlorophenyl, 2,5-dichlorophenyl or 2,3,6-trichlorophenyl radical; and with the exception of those compounds of formula I in which R is hydrogen and B is a 2,4-dinitrophenyl radical. (Machine-translation by Google Translate, not legally binding)